The grooved feed throat is intensively cooled so the material would not prematurely melt and hinder pressure development. The pressure from the grooved feed throat transfers through the barrel, counteracting the discharge-pressure resistance. If the feed-throat pressure development exceeds the discharge pressure, the output will exceed the drag flow, resulting in further throughput gains.

The Groove Feed Bush and Sleeved Barrel features an intensively cooled grooved feed throat that prevents premature melting of the material, which can otherwise impede pressure build-up. This cooling ensures that pressure generated in the feed throat is effectively transferred through the barrel, opposing the resistance at the discharge end. When the pressure developed at the feed throat surpasses the discharge pressure, it leads to an increase in throughput beyond typical drag flow limits, resulting in significant production gains. This design optimizes material processing by enhancing pressure control and improving overall extruder efficiency.